Refer to directories as "folders" in Windows.

Sure, probably everybody is familiar with either term,
but Windows users are probably more familiar with the term
that shows up all over their UI.

README.md

@@ -118,14 +118,14 @@ to install higan.
 [7z]: http://www.7-zip.org/
 
 Once you have a suitable archiving tool,
-extract the contents of the higan archive into a new directory.
+extract the contents of the higan archive into a new folder.
 
 When you're done,
-the new directory should contain `higan.exe` and `icarus.exe`
+the new folder should contain `higan.exe` and `icarus.exe`
 along with other assorted files and directories
 that describe the systems higan emulates.
 
-You may put that directory wherever you like.
+You may put that folder wherever you like.
 
 To run higan, open the `higan.exe` file.
 
@@ -136,7 +136,7 @@ and [configure higan](#configuring-higan).
 Uninstalling an official release on Windows
 -------------------------------------------
 
-Delete the directory containing `higan.exe`
+Delete the folder containing `higan.exe`
 and the other associated data from the original archive.
 
 To remove higan's configuration:
@@ -153,7 +153,7 @@ You might also want to remove the games imported into higan's library
  1. Press Win+R to open the Run dialog
  2. Type `%USERPROFILE%` and press Enter
     to open the folder where higan keeps its game library
- 3. Delete the subdirectory named `Emulation` if it exists
+ 3. Delete the folder named `Emulation` if it exists
 
 Compiling from source on Windows
 --------------------------------
@@ -206,7 +206,7 @@ You should see a message like
 and the corresponding dates.
 If you see an error message like "command not found"
 or "bad command or filename",
-you may need to add mingw's "bin" directory
+you may need to add mingw's "bin" folder
 to your computer's `%PATH%`.
 See the mingw documentation for help with that.
 
@@ -229,23 +229,23 @@ Installing a compiled build on Windows
 --------------------------------------
 
  1. In Windows Explorer,
-    create the directory where you want higan to live
+    create the folder where you want higan to live
  2. Assuming you built higan in `C:\higan-src`,
     copy `C:\higan-src\icarus\out\icarus.exe`
-    into the new directory
+    into the new folder
  3. Copy `C:\higan-src\icarus\Database` and its contents
-    into the new directory
+    into the new folder
  4. Copy `C:\higan-src\higan\out\higan.exe`
-    into the new directory
+    into the new folder
  5. Copy all the `*.sys` directories
     in `C:\higan-src\higan\systems`
-    into the new directory
+    into the new folder
 
-The new directory should now contain
+The new folder should now contain
 `icarus.exe`,
 `higan.exe`,
-a directory named `Database`,
+a folder named `Database`,
-and half a dozen directories named after the systems higan emulates
+and half a dozen folders named after the systems higan emulates
 with `.sys` at the end.
 This is what you would get by downloading an official build,
 as described under
@@ -263,7 +263,7 @@ Uninstalling a compiled build on Windows
 
 The process is the same as
 [Uninstalling an official release on Windows][uninstwin]
-above. You may also wish to delete the higan source directory.
+above. You may also wish to delete the higan source folder.
 
 [uninstwin]: #uninstalling-an-official-release-on-windows